Selecting the number format
You can specify number formatting for the data in the grid. The number format string has three formats for positive, negative and zero values. The formats are separated by a semicolon.
positive format;negative format;zero string
The Number Format option on the Members tab overrides the Number Format option on the Grid tab.
To select a number format:
If the pre-defined formats do not meet your needs, you can specify a custom format by clicking the dialog box launcher in the Number Format group. Custom number formats can be defined for a grid style, a member style or an attribute style.